CN213175540U

CN213175540U - Drilling rod for coal mine gas emission

Info

Publication number: CN213175540U
Application number: CN202021882210.5U
Authority: CN
Inventors: 杨晓刚; 何赟泽
Original assignee: Wuxi Double Horse Drilling Tools Co ltd
Current assignee: Wuxi Double Horse Drilling Tools Co ltd
Priority date: 2020-09-01
Filing date: 2020-09-01
Publication date: 2021-05-11
Anticipated expiration: 2030-09-01

Abstract

The utility model discloses a colliery is drilling rod for gas emission, it includes body, male joint and female joint, and the both ends of body are upset thick, and the external diameter of body is unchangeable, and the tip internal diameter of body is less than the middle part internal diameter to form the conical surface that expands in the port. Above-mentioned drilling rod increases the thickening process one to the body, has increased the intensity of weld zone, has overcome the problem that drilling rod weld zone became invalid, has increased thickening cost in addition, has reduced former tubular product wall thickness requirement, has reduced raw and other materials cost, has certain economic nature, and the whole weight of drilling rod alleviates, has reduced the intensity of labour of colliery borehole operation.

Description

Drilling rod for coal mine gas emission

Technical Field

The utility model relates to a colliery is drilling tool for the rig in the pit especially relates to a colliery is drilling rod for gas emission.

Background

Fig. 2 shows a schematic structural diagram of a conventional mainstream coal mine gas emission drill pipe, which is formed by welding a drill pipe body 1 'with a male joint 2' and a female joint 3 'at two ends of the pipe body 1', wherein the production process flow comprises the steps of sequentially carrying out blanking, heat treatment, straightening, flaw detection and end part processing on the pipe body 1 ', then sequentially carrying out blanking, rough machining, heat treatment, thread machining, thread inspection and marking on the male joint 2' and the female joint 3 ', and then carrying out friction welding, seam quenching and tempering, flash machining, weld seam grinding, weld zone pressure test, weld zone, oil coating and packaging, finished product warehousing and shipping on the pipe body 1' and the two joints.

Because the drill rod of this structure welding, inevitably lead to welding seam department stretching resistance far below connect tensile and body tensile, the welding zone is the weakest link of whole drill rod, and the drill rod often produces inefficacy in the welding zone in the work progress, and bearing capacity is poor, causes certain loss.

SUMMERY OF THE UTILITY MODEL

Based on above, an object of the utility model is to provide a colliery is drilling rod for gas emission solves the easy problem that became invalid, tensile strength is weaker in the welding zone that current drilling rod structure exists.

In order to achieve the purpose, the utility model adopts the following technical proposal:

a drill rod for coal mine gas emission comprises a pipe body, a male connector and a female connector, wherein two ends of the pipe body are upset, the outer diameter of the pipe body is unchanged, and the inner diameter of the end part of the pipe body is smaller than that of the middle part of the pipe body, so that a conical surface expanding from the end part is formed.

The wall thickness of a raw material pipe adopted by the pipe body is reduced by 10% -15% relative to the traditional pipe body, the wall thickness of a port of the pipe body is increased by 20% -25% relative to the traditional pipe body, and the wall thickness of a welding end of the male connector and the pipe body and the wall thickness of a welding end of the female connector and the pipe body are increased by 20% -25%.

To sum up, the beneficial effects of the utility model are that, compared with the prior art, colliery is drilling rod for gas emission increases thickening process one to the body, has increased the intensity of weld zone, has overcome the problem that the drilling rod weld zone became invalid, though increased thickening cost in addition, has nevertheless reduced former tubular product wall thickness requirement, has reduced raw and other materials cost, has certain economic nature, and the whole weight of drilling rod alleviates, has reduced the intensity of labour of colliery borehole operation.

Drawings

FIG. 1 is a schematic structural view of a coal mine gas discharge drill rod provided by an embodiment of the present invention;

fig. 2 is a schematic structural view of a conventional drill rod for coal mine gas drainage.

Detailed Description

The technical solution of the present invention is further explained by the following embodiments with reference to the accompanying drawings.

Referring to fig. 1, the present embodiment provides a drill rod for coal mine gas emission, which includes a pipe body 1, a male joint 2 and a female joint 3, wherein two ends of the pipe body 1 are upset, a pipe end thickening process is mainly added between the blanking process and the heat treatment process of the pipe body 1, the outer diameter of the pipe body 1 is not changed, and the inner diameter H of the end of the pipe body 1 is smaller than the inner diameter D of the middle part, so as to form a conical surface expanding from the end.

Preferably, the wall thickness δ of the raw material pipe used for the pipe body 1 is reduced by 10% to 15% relative to the conventional pipe body 1, the wall thickness S of the port of the pipe body 1 is increased by 20% to 25% relative to the conventional pipe body 1, and the wall thickness of the welding end of the male joint 2 and the pipe body 1 and the wall thickness of the welding end of the female joint 3 and the pipe body 1 are both increased by 20% to 25%.

The following drill rods before and after improvement were compared with specific data:

the existing drill rod of a certain model adopts an S steel grade pipe body with phi 95 x 9 specification, the yield torque is 51390N.m, and the tensile strength is 230.8 t; yield torque 28175n.m, tensile strength 237t of the joint threads; the quenched and tempered G steel grade of the welding seam is 35490N.m, and the tensile strength is 162 t.

The model is improved, and a phi 95 x 8 specification S steel grade pipe body can be selected, the yield torque is 47175N.m, and the tensile strength is 207.5 t; yield torque 28175n.m, tensile strength 237t of the joint threads; quenching and tempering G steel grade 44000N.m of a welding seam, and the tensile strength is 208 t.

Through calculation and comparison, the tensile strength of the drill rod threads, the welding seams and the pipe body before and after improvement is basically in a relatively balanced state, the welding seams are thickened through pipe ends to obtain higher tensile strength, and the tensile strength is improved by nearly 30% compared with that of the original drill rod.

In addition, although a thickening process is added, the thickening cost of each drill rod is 20 yuan, the wall thickness of the pipe body is reduced, 3.2Kg of materials are saved for each drill rod, the material of the pipe body is 26CrMo-1, 7 yuan per kilogram, the cost of the original pipe is 22.4 yuan, namely, the cost of 2.4 yuan is saved, and meanwhile, the problem that the welding area of the drill rod fails is solved.

Therefore, the strength of the welding area is increased, the problem that the welding area of the drill rod fails is solved, the drill rod has certain economical efficiency, the weight of a single drill rod is reduced by 3.2Kg, and the labor intensity of underground operation of a coal mine is reduced.

The above embodiments have been merely illustrative of the basic principles and features of the present invention, and the present invention is not limited by the above embodiments, and does not depart from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. The drill rod for coal mine gas emission comprises a pipe body, a male connector and a female connector and is characterized in that two ends of the pipe body are upset, the outer diameter of the pipe body is unchanged, and the inner diameter of the end part of the pipe body is smaller than that of the middle part of the pipe body, so that a conical surface expanding from the end part is formed.

2. The drill rod for coal mine gas drainage according to claim 1, characterized in that: the wall thickness of the pipe body is reduced by 10% -15%, the wall thickness of the port of the pipe body is increased by 20% -25%, and the wall thickness of the welding end of the male connector and the pipe body and the wall thickness of the welding end of the female connector and the pipe body are increased by 20% -25%.